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vp0619520 05-26-2012 02:37 AM
pae kernel with xen
 
Hi all,
I have Mint in my laptop,and it has 4G memory.I just install the PAE kernel.The OS is running normally.I can see the memory is totally distinguished by using command "free".Then I install the xen-hypervisor and reboot the computer.I can see the DOM0 with the command "xm",below is the output:
Code:
xm list
Name                                        ID  Mem VCPUs      State  Time(s)
Domain-0                                    0  3066    2    r-----    154.5
But I also found that there are only about 3G RAM distinguished by the kernel.
Code:
free -m
            total      used      free    shared    buffers    cached
Mem:          2926        955      1971          0        111        401
-/+ buffers/cache:        442      2483
Swap:        3906          0      3906
The kernel running now is
Code:
uname -r
3.2.0-24-generic-pae
Can anyone tell me how did it come to this?Do I need to change the system to 64bit for using more than 4G RAM in the xen kernel? Thanks a lot!

vp0619520 05-29-2012 04:09 AM
Hi all,
I have change the OS to the 64bit version.And I install the xen-hypervisor,then I boot from this kernel.It seems the memory is still can not be
fully distinguished .

blue_print 05-29-2012 07:12 AM
Install ListHardware package and see if the system has 4GB RAM physically.

Code:
yum install lshw (RHEL/CENTOS/FEDORA)
apt-get install lshw (Ubutu/Debian)

To check the memory


Code:
lshw | grep 'bank' -A10

chrism01 05-29-2012 07:11 PM
32 Bit SW can only use max of 4GB (in fact more like 3.5-3.7 due to some overhead).
Changing the OS to 64 bit isn't going to help if you've only got 4GB of physical RAM... in fact even then you'd need 64 bit SW to be able to make use of more RAM for that process.

vp0619520 05-29-2012 08:06 PM
Quote:
Originally Posted by chrism01 (Post 4690715)
32 Bit SW can only use max of 4GB (in fact more like 3.5-3.7 due to some overhead).
Changing the OS to 64 bit isn't going to help if you've only got 4GB of physical RAM... in fact even then you'd need 64 bit SW to be able to make use of more RAM for that process.

Sorry,what's the meaning of "SW"?

chrism01 05-30-2012 06:48 PM
SW = software HW = hardware OS = Operating System :)

vp0619520 05-30-2012 08:10 PM
Quote:
Originally Posted by chrism01 (Post 4691595)
SW = software HW = hardware OS = Operating System :)
Thanks, I just installed the xen-hypervisor for amd64.But it seems there is no affection.


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